Aluminium oxide is impermeable and, unlike the oxide layers on many other metals, it adheres strongly to the parent metal. If damaged mechanically, aluminiumâs oxide layer repairs itself immediately.
Saliva helps remove oral waste and cavity-causing bacteria, protects teeth from decay by neutralizing harmful acids, and helps re-mineralize tooth enamel. Saliva also keeps oral tissues healthy by preventing infection by controlling bacteria and fungi in the mouth.
A variety of circumstances can cause these glands to produce too much saliva in some people. This condition can be related to taking certain medicines, having specific medical conditions or as a result of ingesting certain poisons. The average person produces up to 2 quarts (1.9 liters) of saliva a day.